Base for office chair



FIG. 1 is a top, perspective view of a base for office chair in accordance with the present invention;

FIG. 2 is a front, elevational view of the base for office chair shown in FIG. 1;

FIG. 3 is a rear, elevational view of the base for office chair shown in FIG. 1;

FIG. 4 is a right side, elevational view of the base for office chair shown in FIG. 1;

FIG. 5 is a top, elevational view of the base for office chair shown in FIG. 1; and,

FIG. 6 is a bottom, elevational view of the base for office chair shown in FIG. 1. 

The ornamental design for a base for office chair, as shown and described. 